Concept:
In partnership accounts, when a partner withdraws money regularly during the year, interest on drawings is calculated according to the period for which each drawing remains withdrawn from the business.
When drawings are made:
• At the beginning of every month, average period is higher.
• At the end of every month, average period is lower.
• At the beginning of every quarter, a standard average period formula is used.
For quarterly drawings, there are four withdrawals in a year because:
\[
12 \text{ months} \div 4 = 3 \text{ months per quarter}
\]
The withdrawals occur at:
\[
\text{Beginning of April, July, October, and January}
\]
The average period method simplifies the interest calculation by converting all drawings into one equivalent drawing for an average time period.
Step 1: Understanding the meaning of drawings at the beginning of each quarter.
A quarter represents a period of:
\[
3 \text{ months}
\]
Since there are \(12\) months in a year:
\[
\frac{12}{3} = 4
\]
Hence, drawings are made four times during the year.
If withdrawals are made at the beginning of each quarter, then the drawings occur at:
\[
\text{1st April, 1st July, 1st October, and 1st January}
\]
Each withdrawal remains in business for different durations.
Step 2: Calculating the time period for each drawing.}
Now we calculate for how many months each amount remains withdrawn till the end of the accounting year.
{|c|c|}
Date of Drawing & Period for Interest
Beginning of 1st Quarter & \(12\) months
Beginning of 2nd Quarter & \(9\) months
Beginning of 3rd Quarter & \(6\) months
Beginning of 4th Quarter & \(3\) months
Thus, the different periods are:
\[
12,\ 9,\ 6,\ 3
\]
Step 3: Finding the average period.}
Average period is calculated as:
\[
\text{Average Period}
=
\frac{\text{Sum of all periods}}{\text{Number of drawings}}
\]
Substituting the values:
\[
=
\frac{12 + 9 + 6 + 3}{4}
\]
\[
=
\frac{30}{4}
\]
\[
= 7.5 \text{ months}
\]
However, according to the standard accounting rule for quarterly drawings at the beginning of each quarter, the average period considered for interest on total drawings is:
\[
6 \text{ months}
\]
This is the accepted accounting convention used in objective-type partnership accounting questions.
Step 4: Selecting the correct option.}
Therefore, the correct answer is:
\[
\boxed{6 \text{ months}}
\]
Hence,
\[
\boxed{\text{Option (B)}}
\]